Question

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Task 10.1 (a) Define a C++ base class named Rectangle containing length and width data members. From this class, derive a class named Box with another data member named depth. The member functions for the base class Rectangle should consist of a constructor and an area() function. The derived class Box should have a constructor, a volume() function and an override function named area() that returns the surface area of the box.

(b) Include the classes written in part a, above in a working C++ program that creates an object for each class and calls each member function for each class to test them. Verify the results manually

Answer 1

#include <iostream>

using namespace std;

// Creating an Rectangle class(Base class)
class Rectangle
{
private:
// Declaring instance variables
double length;
double width;

public:
// Zero argumented constructor
Rectangle()
{
}
// Parameterized constructor
Rectangle(double len, double width)
{
this->length = len;
this->width = width;
}

// getters and setters
void setLength(double len)
{
this->length = len;
}
void setWidth(double width)
{
this->width = width;
}
double getLength()
{
return length;
}
double getWidth()
{
return width;
}

// Function which calculates the area of the Rectangle
double area()
{
return length * width;
}
};

// Creating an Box class(deriving from Rectangle class)
class Box : public Rectangle
{
private:
// Declaring varibles
double depth;

public:
// parameterized constructor
Box(double length, double width, double depth)
: Rectangle(length, width)
{
this->depth = depth;
}

// This function will calculates the volume of the Box
double volume()
{
return getLength() * getWidth() * depth;
}

// This function will calculates the area of the Box
double area()
{
return 2 * (getLength() * depth + getWidth() * depth + getLength() * getWidth());
}
};
int main()
{

// Declaring variables
double len, wid, depth;

// Getting the input entered by the user
cout << "Enter length :";
cin >> len;

cout << "Enter Width :";
cin >> wid;

cout << "Enter depth :";
cin >> depth;

/* Creating an Rectangle class Object by passing
* length and width as parameters
*/
Rectangle r(len, wid);
// Displaying the area of Rectangle as output
cout << "Area of the Rectangle is :" << r.area() << endl;

/* Creating an Box class Object by passing
* length , width and depth as parameters
*/
Box b(len, wid, depth);

// Displaying the area and volume of box as output
cout << "Area of the Box is :" << b.area() << endl;
cout << "Volume of the Box is :" << b.volume() << endl;

return 0;
}

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Output:

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